package com.xiyue.lenovo.activityforresult;

import android.app.ExpandableListActivity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class SelectCityActivity extends ExpandableListActivity {
    //定义省份数组
    private  String[] provinces = new String[]{
      "广东","广西","湖南"
    };
    private String[][] cities = new String[][]{
            {"广州","深圳","珠海","中山"},
            {"桂林","柳州","南宁","北海"},
            {"长沙","岳阳","衡阳","株洲"}

    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ExpandableListAdapter adapter= new BaseExpandableListAdapter() {
            // 获取指定组位置、指定子列表项处的子列表项数据
            @Override
            public Object getChild(int groupPosition, int childPosition)
            {
                return cities[groupPosition][childPosition];
            }
            @Override
            public long getChildId(int groupPosition, int childPosition)
            {
                return childPosition;
            }
            @Override
            public int getChildrenCount(int groupPosition)
            {
                return cities[groupPosition].length;
            }
            private TextView getTextView()
            {
                AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                        ViewGroup.LayoutParams.MATCH_PARENT, 64);
                TextView textView = new TextView(SelectCityActivity.this);
                textView.setLayoutParams(lp);
                textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
                textView.setPadding(36, 0, 0, 0);
                textView.setTextSize(20);
                return textView;
            }
            // 该方法决定每个子选项的外观
            @Override
            public View getChildView(int groupPosition, int childPosition,
                                     boolean isLastChild, View convertView, ViewGroup parent)
            {
                TextView textView = getTextView();
                textView.setText(getChild(groupPosition, childPosition)
                        .toString());
                return textView;
            }
            // 获取指定组位置处的组数据
            @Override
            public Object getGroup(int groupPosition)
            {
                return provinces[groupPosition];
            }
            @Override
            public int getGroupCount()
            {
                return provinces.length;
            }
            @Override
            public long getGroupId(int groupPosition)
            {
                return groupPosition;
            }
            // 该方法决定每个组选项的外观
            @Override
            public View getGroupView(int groupPosition, boolean isExpanded,
                                     View convertView, ViewGroup parent)
            {
                LinearLayout ll = new LinearLayout(SelectCityActivity.this);
                ll.setOrientation(LinearLayout.HORIZONTAL);
                ImageView logo = new ImageView(SelectCityActivity.this);
                ll.addView(logo);
                TextView textView = getTextView();
                textView.setText(getGroup(groupPosition).toString());
                ll.addView(textView);
                return ll;
            }
            @Override
            public boolean isChildSelectable(int groupPosition,
                                             int childPosition)
            {
                return true;
            }
            @Override
            public boolean hasStableIds()
            {
                return true;
            }
        };
        // 设置该窗口显示列表
        setListAdapter(adapter);
        getExpandableListView().setOnChildClickListener(
                new ExpandableListView.OnChildClickListener()
                {
                    @Override
                    public boolean onChildClick(ExpandableListView parent,
                                                View source, int groupPosition, int childPosition,
                                                long id)
                    {
                        // 获取启动该Activity之前的Activity对应的Intent
                        Intent intent = getIntent();
                        intent.putExtra("city",
                                cities[groupPosition][childPosition]);
                        // 设置该SelectCityActivity的结果码，并设置结束之后退回的Activity
                        SelectCityActivity.this.setResult(0, intent);
                        // 结束SelectCityActivity。
                        SelectCityActivity.this.finish();
                        return false;
                    }
                });
    }
}
